Question

For n∈Z ;cos(2theta)=√5+1/4 implies theta=

Answer 1

Answer:

theta=nπ+π/10 is the answer of this question

Answer 2

Step-by-step explanation:

$firstly \: you \: should \: know \: that \: \\ \frac{ \sqrt{5 } + 1}{4} = \cos(36) = \sin(18) \\ so \: \cos(2 \alpha ) = \frac{ \sqrt{5} + 1}{4} \\ \cos(2 \alpha ) = \cos(36) \\ 2 \alpha = 36 \\ \alpha = 18$

suppose theta equals to alpha please